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Tyre pressures
#1661235
14/10/2022 12:03
14/10/2022 12:03
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Joined: Feb 2006
Posts: 5,408 Essex
Trappy
OP
Forum is my life
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OP
Forum is my life
Joined: Feb 2006
Posts: 5,408
Essex
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I've just came across an article talking about changing tyre pressures to suit a change in tyre (wheel) size. The thinking being that a reduction in tyre sidewall size increases its stiffness, and therefore increases its load capacity, thus less air is required to maintain the same load capacity. The proposal is that one should look up the load capacity of the original tyre by its required pressure and reference this against the load capacity of the new tyre size where the required pressue would be listed. For my car, I've moved from the original 205/50/16 to 235/40/17 and so I'd need to look up the load capacity of the 205/50/16. According to the website, this is 1277lbs as the stock pressure is listed as 39psi. Cross referencing this 1277lbs load capacity against the pressure required by a 235/40/17 gives me 35psiGiven that this calculation doesn't factor in the differing tyre walls across different tyre brands and models, this could easily acount for the bone shattering ride some owners have complained of over the years when running larger diameter wheels... Throw in heavier wheel and tyre combinations, stiffer sidewalls and stiffer suspension and its only going to get worse.
F****** b****** thing...
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Re: Tyre pressures
[Re: Trappy]
#1661246
14/10/2022 14:51
14/10/2022 14:51
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Joined: Mar 2008
Posts: 5,103 highlands
jimboy
Club Member 857
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Club Member 857
Forum is my life
Joined: Mar 2008
Posts: 5,103
highlands
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I’ve been running with 35 psi for some time now makes for a more comfortable ride. I certainly will not be doing anything like 155 mph so 35 psi will be quite safe.
I'm an old git & happy with it,most of the time
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Re: Tyre pressures
[Re: Trappy]
#1661257
14/10/2022 17:32
14/10/2022 17:32
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GrahamL
Unregistered
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GrahamL
Unregistered
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IMO 39 psi is too high even on the standard wheels, 33-36 is more like it depending on the quality of roads you drive on.
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Re: Tyre pressures
[Re: ]
#1662814
08/01/2023 13:15
08/01/2023 13:15
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Joined: Sep 2007
Posts: 1,017 Behind Enemy Lines
Master_Mariner
Club member 583
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Club member 583
Enjoying the ride
Joined: Sep 2007
Posts: 1,017
Behind Enemy Lines
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IMO 39 psi is too high even on the standard wheels, 33-36 is more like it depending on the quality of roads you drive on. Can absolutely relate to Graham, See my subtle attempts to reduce "crashiness" in previous posts. The number one best factor was Joe (Country Cruising) reducing the pressure all around after a shakedown test drive. Have driven them at lower pressure ever since- no issues of lost grip. No issues of advance tyre wear. But noticeably less bouncy. The number two factor was replacing my Toyo Proxes for the "newer" Toyo design (I'm on the plus alloy wheel design size wheel so limited choice) and this has had a felt difference. Additional factor - quite some time gently tightening up old trim screws in the cabin, and pads to the doors and handles where they meet plastic on plastic. You'd be surprised of the improvement! Regards all,, MM
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Re: Tyre pressures
[Re: Edinburgh]
#1664825
22/04/2023 18:45
22/04/2023 18:45
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Joined: Dec 2005
Posts: 642 France, Charente
paulw
Club Member 1326
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Club Member 1326
Enjoying the ride
Joined: Dec 2005
Posts: 642
France, Charente
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That's interesting, I too use Proxies on the same size wheel as you and run them at round 36 front, 30 rear which helps.
I'll look into the Goodyear Eagles. I remember that I always used to run Goodyear Eagles on my first Coupé (standard wheels) and was very happy with them. I only changed when I got the current Coupé, it already had 17" wheels fitted (can't remember the tyres) and then had Toyos fitted when I bought the new wheels. My old brain may be deceiving me, but it does seem to be a more 'comfortable' ride now than when the Toyos were new!
Paul W.
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